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    <title>Document</title>
    <script>
    // 封装一个去重的函数unique 
    function unique(arr) {
        var newArr = [];
        for (var i = 0; i <arr.length; i++) {
            if(newArr.indexOf(arr[i]) === -1) {
                newArr.push(arr[i]);
            }
        }
        return newArr;
    }
    var demo = unique([2,2,3,5,6,9,4,4,5,6,6,4,6,5]);
    console.log(demo);
    </script>
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